btw: i once owned a SEGA Mega Drive. i had famicom, sega mega drive then PS1 tapos ngaun PS3.

the only games i remember playing in mega drive was sonic.. i had a couple more games but could no longer remember the title. i only had a few mega drive titles (bala as we call it) kasi sobrang mahal noon. kaya ung binili ko before is ung mga 8in1 or 3in1.hehehe

I have always thought that there was no need to convert the consoles, the TV's are all from Japan, so I don't think there's a compatibility issue, just try checking the adapter if you blew a fuse man. It's either that or the RF coaxial cable is loose or are you using the AV composite plugs? The only issue that I know is that light guns/zappers will not work on HD TV's, only analog ones.